WO2022059658A1 - Bougie d'allumage - Google Patents

Bougie d'allumage Download PDF

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Publication number
WO2022059658A1
WO2022059658A1 PCT/JP2021/033631 JP2021033631W WO2022059658A1 WO 2022059658 A1 WO2022059658 A1 WO 2022059658A1 JP 2021033631 W JP2021033631 W JP 2021033631W WO 2022059658 A1 WO2022059658 A1 WO 2022059658A1
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WO
WIPO (PCT)
Prior art keywords
titanium oxide
resistor
terminal fitting
center electrode
resistance layer
Prior art date
Application number
PCT/JP2021/033631
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English (en)
Japanese (ja)
Inventor
研悟 藤村
翔麻 津曲
宗 都原
裕一 山田
Original Assignee
日本特殊陶業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本特殊陶業株式会社 filed Critical 日本特殊陶業株式会社
Priority to US17/998,995 priority Critical patent/US20230178968A1/en
Priority to EP21869345.5A priority patent/EP4156424A4/fr
Priority to JP2022517360A priority patent/JP7319463B2/ja
Priority to CN202180038040.3A priority patent/CN115699484B/zh
Publication of WO2022059658A1 publication Critical patent/WO2022059658A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/41—Sparking plugs structurally combined with other devices with interference suppressing or shielding means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

Definitions

  • the technology disclosed herein relates to spark plugs.
  • a terminal fitting is inserted / fixed on one end side of the shaft hole of the insulator, and a center electrode is inserted / fixed on the other end side, and in the shaft hole. It is known to have a structure in which a resistor is arranged between a terminal fitting and a center electrode. The resistor functions as an electric resistance between the terminal fitting and the center electrode, thereby suppressing the generation of radio wave noise during spark discharge.
  • the spark plug disclosed by the present specification is held by a tubular main metal fitting, a tubular insulator having a shaft hole extending in the axial direction and held inside the main metal fitting, and one end of the shaft hole.
  • a center electrode, a terminal fitting held at the other end of the shaft hole, and a resistor arranged between the center electrode and the terminal fitting in the shaft hole and containing glass and a conductive material are provided.
  • the resistor is arranged on the most center electrode side and is arranged on the titanium oxide-containing region containing titanium oxide and on the terminal fitting side of the titanium oxide-containing region, and the titanium oxide content is in the titanium oxide-containing region.
  • the titanium oxide reduction region which is lower than or does not contain titanium oxide, is provided, and the titanium oxide content decreases from the center electrode side to the terminal fitting side as a whole.
  • both electrical durability and radio noise suppression performance can be achieved at the same time.
  • FIG. 1 is a cross-sectional view of the spark plug of the first embodiment.
  • FIG. 2 is a schematic cross-sectional view for explaining the axial length of the first resistance layer provided in the spark plug of the first embodiment.
  • FIG. 3 is another schematic cross-sectional view for explaining the axial length of the first resistance layer provided in the spark plug of the first embodiment.
  • FIG. 4 is a cross-sectional view of the spark plug of the second embodiment.
  • FIG. 5 is a cross-sectional view of the spark plug of the third embodiment.
  • FIG. 6 is a cross-sectional view of the spark plug of the fourth embodiment.
  • the spark plug disclosed in the present specification includes a tubular main metal fitting, a tubular insulator held inside the main metal fitting and having a shaft hole extending in the axial direction, and one end of the shaft hole.
  • the resistor is arranged on the most central electrode side, and the titanium oxide-containing region containing titanium oxide and the terminal fitting side of the titanium oxide-containing region are arranged, and the titanium oxide content is the oxidation.
  • a titanium oxide reduction region that is lower than the titanium-containing region or does not contain titanium oxide is provided, and the titanium oxide content decreases from the center electrode side to the terminal fitting side as a whole.
  • the resistor has a plurality of layers, and the content of titanium oxide is the center.
  • the resistance gradually decreases from the electrode side toward the terminal fitting side, and the resistor is not clearly divided into multiple layers, and the titanium oxide content increases from the center electrode side toward the terminal fitting side. Includes both cases of continuous decline.
  • the content of titanium oxide in the titanium oxide-containing region may be 1% by mass or more and 15% by mass or less.
  • titanium oxide When the content of titanium oxide is 1% by mass or more, sufficient electrical durability can be obtained. When the content of titanium oxide is 15% by mass or less, a sufficient effect of suppressing radio wave noise is maintained.
  • the spark plug may have a titanium oxide-free region that does not contain titanium oxide as the titanium oxide reduction region.
  • Radio noise can be further suppressed by setting the region of the resistor closest to the terminal fitting as the titanium oxide-free region.
  • the titanium oxide content of the resistor may be gradually decreased from the center electrode side to the terminal fitting side.
  • the titanium oxide content of the resistor may gradually decrease from the center electrode side toward the terminal fitting side.
  • the length of the titanium oxide-containing region may be 1 mm or more.
  • the titanium oxide reduction region may have an end on the terminal fitting side closer to the terminal fitting than the main fitting.
  • the crystal structure of titanium oxide contained in the resistor may be composed only of rutile type.
  • the electrical durability can be further improved when the crystal structure of titanium oxide contained in the resistor is the rutile type rather than the anatase type.
  • the spark plug 1 is attached to the cylinder head of the internal combustion engine and is used to ignite the air-fuel mixture in the combustion chamber of the internal combustion engine.
  • the spark plug 1 includes an insulator 10, a main metal fitting 20, a center electrode 30, a terminal metal fitting 40, a resistor 50, sealing members 60 and 70, and a ground electrode 80. ..
  • the one-dot broken line in FIG. 1 indicates the axis AX of the spark plug 1.
  • axis direction the direction parallel to the axis AX (vertical direction in FIG. 1)
  • the lower side in FIG. 1 is referred to as the front end side of the spark plug 1
  • the upper side in FIG. 1 is referred to as the rear end side of the spark plug 1.
  • the insulator 10 is a substantially cylindrical member having a shaft hole 11 extending along the axis AX and extending in the axial direction inside.
  • the insulator 10 is formed by using ceramics such as alumina.
  • the main metal fitting 20 is a member used when the spark plug 1 is attached to the cylinder head. As shown in FIG. 1, the main metal fitting 20 has a cylindrical shape extending in the axial direction as a whole, and is made of a conductive metal material (for example, a low carbon steel material).
  • the main metal fitting 20 is provided with a through hole 21 penetrating in the axial direction inside, and the insulator 10 is held inside the main metal fitting 20 so as to be inserted through the through hole 21.
  • the rear end of the insulator 10 projects outward (upper side in FIG. 1) from the rear end of the main metal fitting 20.
  • the tip of the insulator 10 projects outward (lower side in FIG. 1) from the tip of the main metal fitting 20.
  • the center electrode 30 includes a rod-shaped center electrode main body 31 extending along the axial direction and a columnar tip 32 attached to the tip of the center electrode main body 31.
  • the center electrode body 31 is held on the tip end side of the shaft hole 11 of the insulator 10 so that the tip portion thereof is exposed to the outside of the insulator 10.
  • the center electrode main body 31 is made of nickel (Ni) or a nickel-based alloy containing the largest amount of nickel (for example, NCF600, NCF601, etc.).
  • the center electrode main body 31 may have a two-layer structure including an outer layer portion (base material) made of nickel or a nickel-based alloy and a core portion embedded in the outer layer portion.
  • the core portion is preferably formed of copper (Cu), which has higher thermal conductivity than the outer layer portion, or a copper-based alloy containing the largest amount of copper.
  • the chip 32 contains a precious metal such as platinum or iridium as a main component. The chip 32 can be omitted.
  • the terminal fitting 40 is a rod-shaped member extending in the axial direction, and is held on the rear end side of the shaft hole 11 of the insulator 10 so that its rear end is exposed to the outside of the insulator 10. Has been done.
  • the terminal fitting 40 is arranged in the shaft hole 11 on the rear end side of the center electrode 30.
  • the terminal fitting 40 is made of a conductive metal material (for example, low carbon steel).
  • the surface of the terminal fitting 40 may be plated with nickel or the like for the purpose of corrosion protection or the like.
  • the terminal fitting 40 includes a flange portion 41 formed at a predetermined position in the axial direction, a terminal connection portion 42 located on the rear end side of the flange portion 41, and a leg portion 43 on the tip end side of the flange portion 41. I have.
  • the leg portion 43 is inserted into the shaft hole 11 of the insulator 10.
  • the terminal connection portion 42 is exposed on the rear end side of the insulator 10.
  • a plug cap to which a high-voltage cable (not shown) is connected is attached to the terminal connection portion 42, and a high voltage for generating a discharge is applied.
  • the resistor 50 is arranged between the tip of the terminal fitting 40 and the rear end of the center electrode 30 in the shaft hole 11 of the insulator 10.
  • the resistor 50 has, for example, a resistance value of 1 k ⁇ or more (for example, 5 k ⁇ ), and has a function of reducing radio wave noise when a spark is generated. The detailed configuration of the resistor 50 will be described later.
  • a conductive sealing member 60 is arranged between the tip of the resistor 50 in the shaft hole 11 and the rear end of the center electrode 30. Further, a conductive sealing member 70 is arranged between the rear end of the resistor 50 in the shaft hole 11 and the tip of the terminal fitting 40.
  • the sealing members 60 and 70 are formed of a composition containing a conductive material, for example, glass particles such as B2O3 - SiO2 system and metal particles (Cu, Fe, etc.).
  • the ground electrode 80 has a shape bent in a substantially L shape in the middle as a whole, and its rear end is joined to the tip of the main metal fitting 20. Then, the tip portion thereof is arranged so as to face the tip 32 at the tip of the center electrode 30 while maintaining a distance.
  • the ground electrode 80 and the main metal fitting 20 are joined to each other by, for example, resistance welding, laser welding, or the like. As a result, the ground electrode 80 and the main metal fitting 20 are electrically connected to each other.
  • the ground electrode 80 is made of, for example, nickel or a nickel-based alloy.
  • the resistor 50 is formed of a composition containing glass particles as a main component and a conductive material.
  • a material such as B 2 O 3 -SiO 2 system, BaO-B 2 O 3 system, SiO 2 -B 2 O 3 -CaO-BaO system can be adopted.
  • the conductive material for example, a non-metal conductive material such as carbon particles (carbon black or the like), TiC particles, TiN particles, or a metal such as Al, Mg, Ti, Zr and Zn can be adopted.
  • the resistor 50 of the present embodiment further contains titanium oxide particles.
  • the resistor 50 has a two-layer structure, and has a first resistance layer 50A (an example of a titanium oxide-containing region) arranged on the center electrode 30 side and a second resistance layer 50B (an example of a titanium oxide-containing region) arranged on the terminal fitting 40 side. It is composed of an example of a titanium oxide reduction region). Both the first resistance layer 50A and the second resistance layer 50B contain titanium oxide. The second resistance layer 50B arranged closer to the terminal fitting 40 than the first resistance layer 50A has a lower titanium oxide content than the first resistance layer 50A.
  • the effect of suppressing an increase in resistance value is improved.
  • the amount of titanium oxide added to the resistor 50 is increased for the purpose of improving the electrical durability, the effect of suppressing radio wave noise is reduced.
  • the content of titanium oxide in the first resistance layer 50A is 1% by mass or more. When the content of titanium oxide is 1% by mass or more, sufficient electrical durability can be obtained. Further, it is preferable that the content of titanium oxide in the first resistance layer 50A is 15% by mass or less. Even in the region of the resistor 50 on the center electrode 30 side, if the titanium oxide content is too high, there is a concern that the effect of suppressing radio wave noise may be reduced. When the content of titanium oxide is 15% by mass or less in this region, a sufficient effect of suppressing radio wave noise is maintained.
  • the length L of the first resistance layer 50A in the axial direction is preferably 1 mm or more. This is because sufficient electrical durability can be ensured if the thickness is 1 mm or more.
  • the axial length L of the first resistance layer 50A is represented by the distance between the end E1 on the center electrode 30 side and the end E2 on the terminal fitting 40 side in the first resistance layer 50A.
  • the end E1 on the center electrode 30 side has a flat end surface (interface with the seal member 60) on the center electrode 30 side of the first resistance layer 50A, and is a surface perpendicular to the axis AX. For example, it means the end face.
  • the end surface of the first resistance layer 50A on the center electrode 30 side has irregularities or is inclined diagonally with respect to the axis AX
  • the end surface of the first resistance layer 50A on the center electrode 30 side means a plane perpendicular to the axis AX, including the portion of the first resistance layer 50A closest to the center position in the axis direction.
  • the end surface of the first resistance layer 50A on the center electrode 30 side is a concave surface whose central portion is recessed toward the tip side
  • the end E1 is perpendicular to the axis AX including the peripheral edge of the end surface. It is a face. Further, as shown in FIG.
  • the end E1 is on the axis AX including the central portion of the end surface. It is a vertical surface. The same applies to the end E2 on the terminal fitting 40 side.
  • the end E3 on the terminal fitting 40 side is closer to the terminal fitting 40 than the main fitting 20.
  • radio wave noise tends to leak from the end of the main metal fitting 20 on the terminal metal fitting 40 side. If the end E3 on the terminal fitting 40 side of the second resistance layer 50B is closer to the terminal fitting 40 than the main fitting 20, it is effective that radio wave noise leaks from the end on the terminal fitting 40 side in the main fitting 20. Can be suppressed.
  • the end E3 on the terminal fitting 40 side of the second resistance layer 50B has a flat end surface (interface with the sealing member 70) on the terminal fitting 40 side of the second resistance layer 50B and is perpendicular to the axis AX. If, it means the end face. If the end surface of the second resistance layer 50B on the terminal fitting 40 side has irregularities or is inclined diagonally with respect to the axis AX, the end surface of the second resistance layer 50B on the terminal fitting 40 side. It means a plane perpendicular to the axis AX, including the portion closest to the center electrode 30 side.
  • the crystal structure of titanium oxide contained in the resistor 50 is preferably composed of only rutile type.
  • the crystal structure of titanium oxide is rutile type rather than anatase type, the electrical durability can be further improved.
  • the center electrode 30 is inserted into the shaft hole 11 from the rear end side.
  • the center electrode 30 is held on the tip end side of the shaft hole 11.
  • the raw material powder of the sealing member 60 is poured into the inside of the shaft hole 11 from the rear end side and filled around the rear end portion of the center electrode 30.
  • the raw material powder of the filled seal member 60 is precompressed using a press pin.
  • the raw material powder of the first resistance layer 50A is poured into the inside of the shaft hole 11 from the rear end side, and the raw material powder of the seal member 60 after precompression is overlaid and filled, and precompressed.
  • the raw material powder of the second resistance layer 50B is poured into the inside of the shaft hole 11 from the rear end side, and the raw material powder of the first resistance layer 50A after precompression is overlaid and filled, and precompressed.
  • the raw material powder of the first resistance layer 50A contains more titanium oxide than the raw material powder of the second resistance layer 50B.
  • the raw material powder of the seal member 70 is poured into the inside of the shaft hole 11 from the rear end side, and the raw material powder of the second resistance layer 50B after precompression is overlaid and filled, and precompressed.
  • the insulator 10 into which the terminal fitting 40 is inserted is installed in an electric furnace, and the raw material powders of the sealing members 60, 70, the first resistance layer 50A and the second resistance layer 50B are heated while being compressed by the terminal fitting 40. Each raw material powder is compressed and sintered to form sealing members 60 and 70, a first resistance layer 50A and a second resistance layer 50B.
  • the spark plug 1 is completed by performing necessary processes such as assembling the main metal fitting 20 and processing the ground electrode 80.
  • the spark plug 1 of the present embodiment includes a resistor 50, and the resistor 50 is arranged on the side of the center electrode 30 most from the first resistance layer 50A containing titanium oxide and the first resistance layer 50A. Is also arranged on the terminal fitting 40 side, and includes a second resistance layer 50B having a titanium oxide content lower than that of the first resistance layer 50A.
  • the first resistance layer 50A which is the region of the resistor 50 on the side of the center electrode 30
  • the second resistance layer 50B having a relatively low concentration of titanium oxide
  • the content of titanium oxide in the first resistance layer 50A is 1% by mass or more and 15% by mass or less.
  • the content of titanium oxide is 1% by mass or more, sufficient electrical durability can be obtained.
  • the content of titanium oxide is 15% by mass or less, a sufficient effect of suppressing radio wave noise is maintained.
  • the length L of the first resistance layer 50A is 1 mm or more. Electrical durability can be ensured at the position closest to the center electrode 30 among the resistors 50.
  • the end E3 on the terminal fitting 40 side is closer to the terminal fitting 40 than the main fitting 20. It is possible to further suppress the leakage of radio wave noise from the end of the main metal fitting 20 on the terminal metal fitting 40 side.
  • the crystal structure of titanium oxide contained in the resistor 50 consists only of the rutile type.
  • the electrical durability can be further improved.
  • the resistor 110 is arranged between the tip of the terminal fitting 40 and the rear end of the center electrode 30 in the shaft hole 11, and has a composition including glass particles as a main component and a conductive material. It is made of objects.
  • the resistor 110 has a two-layer structure, and has a first resistance layer 110A (an example of a titanium oxide-containing region) arranged on the center electrode 30 side and a second resistance layer 110B (an example of a titanium oxide-containing region) arranged on the terminal fitting 40 side. It is composed of a titanium oxide-reduced region and an example of a titanium oxide-free region).
  • the first resistance layer 110A contains titanium oxide.
  • the second resistance layer 110B does not contain titanium oxide.
  • titanium oxide-free does not mean only that titanium oxide is not contained at all, but also means that titanium oxide below the detection limit is present as an impurity.
  • the detection of titanium oxide in the resistor can be performed, for example, by performing elemental analysis by EDS (Energy Dispersive X-ray spectroscopy) to check for the presence or absence of titanium.
  • the same action and effect as in the first embodiment are exhibited.
  • the region of the resistor 110 on the terminal fitting 40 side is a second resistance layer 110B containing no titanium oxide. As a result, radio wave noise can be further suppressed.
  • the spark plug 120 of the present embodiment has a different structure of the resistor 130 from the first embodiment.
  • the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
  • the resistor 130 is arranged between the tip of the terminal fitting 40 and the rear end of the center electrode 30 in the shaft hole 11, and has a composition including glass particles as a main component and a conductive material. It is made of objects.
  • the resistor 130 has a three-layer structure, and in order from the tip side, the first resistance layer 130A (an example of a titanium oxide-containing region), the second resistance layer 130B (an example of a titanium oxide reduction region), and the third resistance layer. 130C (an example of the titanium oxide reduction region) is arranged.
  • the content of titanium oxide in the resistor 130 gradually decreases from the center electrode 30 side toward the terminal fitting 40 side. More specifically, the first resistance layer 130A located closest to the center electrode 30 contains the largest amount of titanium oxide. The second resistance layer 130B and the third resistance layer 130C located closer to the terminal fitting 40 than the first resistance layer 130A have a lower titanium oxide content than the first resistance layer 130A. Of these two, the third resistance layer 130C, which is closer to the terminal fitting 40, has a lower titanium oxide content than the second resistance layer 130B.
  • the spark plug 140 of the present embodiment has a different structure of the resistor 150 from the first embodiment.
  • the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
  • the resistor 150 is arranged between the tip of the terminal fitting 40 and the rear end of the center electrode 30 in the shaft hole 11, and has a composition including glass particles as a main component and a conductive material. It is made of objects.
  • the titanium oxide content continuously decreases from the center electrode 30 side toward the terminal fitting 40 side.
  • the region on the center electrode 30 side is the titanium oxide-containing region 150A
  • the region on the terminal fitting 40 side is the titanium oxide reduction region 150B.
  • Test example 1. A test example in which the relationship between the titanium oxide content and the load life characteristics (electrical durability) and radio noise characteristics of the resistor was investigated.
  • Test body A plurality of spark plugs having the same configuration as that of the first embodiment were prepared and used as a test body.
  • the resistor provided in each test piece has a two-layer structure having a resistance layer 1 arranged on the front end side (center electrode side) and a resistance layer 2 arranged on the rear end side (terminal metal fitting side).
  • the compositions of the resistance layer 1 and the resistance layer 2 are shown in Table 1 for each test piece.
  • the test piece has the same structure as that of the resistor except that the compositions of the resistance layer 1 and the resistance layer 2 of the resistor are different from each other.
  • the titanium oxide content contained in the resistance layer 1 and the resistance layer 2 was obtained by performing elemental analysis of the resistance layers 1 and 2 by EDS and converting the measured titanium content into the titanium oxide content. Elemental analysis was performed using a scanning electron microscope JSM-IT300 manufactured by JEOL Ltd. while scanning along the axis of the spark plug in an area of 300 ⁇ 300 ⁇ m.
  • Radio noise test A radio noise test was performed on each test piece. The radio noise test was conducted based on JASO (Japanese Automotive Standards Organization) D-002-2 "Automobile-Radio Noise Characteristics-Part 2 Prevention Device Measurement Method Box Method" in the region of 30 MHz or more and 1000 MHz or less. The amount of noise attenuation was measured. When the noise attenuation amount was less than 20 dB, it was determined that the radio wave noise suppression performance was insufficient, and it was indicated as "x" in Table 1. When the noise attenuation amount was 20 dB or more and 30 dB or less, it was determined that the radio wave noise suppression performance was sufficient, and “ ⁇ ” was displayed in Table 1. When the noise attenuation amount was 30 dB or more, it was judged that the radio wave noise suppression performance was more excellent, and it was indicated as " ⁇ " in Table 1.
  • Test example 1 Test piece for investigating the relationship between the length of the titanium oxide-containing region and the load life characteristic (electrical durability) of the resistor The length of the resistance layer 1 is determined based on the test example 5 of the above embodiment 1. Multiple spark plugs with different characteristics were prepared and used as test specimens. The test piece has the same structure as each other except that the lengths of the resistance layers 1 and 2 in the resistor are different. For each test example, Table 2 shows the length of the resistance layer 1 arranged on the tip side (center electrode side) of the resistors. Test Example 26 is the same as Test Example 4 in the embodiment.
  • the resistor 50 has a two-layer structure
  • the resistor 130 has a three-layer structure, but the resistor may have four or more layers. do not have.
  • the layer on the most center electrode side is the titanium oxide-containing region, and the other is the titanium oxide-reduced region.
  • the resistor 130 does not have the titanium oxide-free region, but the layer on the terminal fitting side may be the titanium oxide-free region. The same applies even when the resistor has four or more layers.
  • the region of the resistor closest to the terminal fitting side is titanium oxide. It may be a non-containing region and may not be a titanium oxide-free region.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Abstract

La présente invention concerne une bougie d'allumage 1 qui comprend : un raccord principal cylindrique 20 ; un isolateur cylindrique 10 qui est maintenu sur le côté interne du raccord principal 20 et comporte un trou axial 11 qui s'étend dans la direction axiale ; une électrode centrale 30 maintenue sur une extrémité du trou axial 11 ; un raccord de borne 40 maintenu sur l'autre extrémité du trou axial 11 ; et une résistance 50 qui contient du verre et un matériau électroconducteur et est disposée dans le trou axial 11, entre l'électrode centrale 30 et le raccord de borne 40. La résistance 50 comprend une première couche de résistance 50A (zone contenant de l'oxyde de titane) qui contient de l'oxyde de titane et est disposée davantage sur le côté électrode centrale 30, et une seconde couche de résistance 50B (zone réduite en oxyde de titane) qui est disposée davantage sur le côté de raccord de borne 40 que la première couche de résistance 50A, et a une teneur en oxyde de titane inférieure à celle de la première couche de résistance 50A. Dans son ensemble, la teneur en oxyde de titane dans la résistance diminue depuis le côté d'électrode centrale 30 vers le côté de raccord de borne 40.
PCT/JP2021/033631 2020-09-16 2021-09-14 Bougie d'allumage WO2022059658A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/998,995 US20230178968A1 (en) 2020-09-16 2021-09-14 Spark plug
EP21869345.5A EP4156424A4 (fr) 2020-09-16 2021-09-14 Bougie d'allumage
JP2022517360A JP7319463B2 (ja) 2020-09-16 2021-09-14 スパークプラグ
CN202180038040.3A CN115699484B (zh) 2020-09-16 2021-09-14 火花塞

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JP2020155562 2020-09-16
JP2020-155562 2020-09-16

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WO2022059658A1 true WO2022059658A1 (fr) 2022-03-24

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US (1) US20230178968A1 (fr)
EP (1) EP4156424A4 (fr)
JP (1) JP7319463B2 (fr)
CN (1) CN115699484B (fr)
WO (1) WO2022059658A1 (fr)

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JP4901990B1 (ja) * 2010-12-17 2012-03-21 日本特殊陶業株式会社 スパークプラグ
JP2014072164A (ja) * 2012-10-02 2014-04-21 Ngk Spark Plug Co Ltd スパークプラグ
JP2015118910A (ja) 2013-11-12 2015-06-25 日本特殊陶業株式会社 スパークプラグ、および、スパークプラグの製造方法
JP2017183122A (ja) * 2016-03-31 2017-10-05 日本特殊陶業株式会社 スパークプラグ

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JP2018032521A (ja) * 2016-08-24 2018-03-01 株式会社Ｓｏｋｅｎ 内燃機関用のスパークプラグ
DE102017217265A1 (de) * 2017-09-28 2019-03-28 Robert Bosch Gmbh Zündkerzen-Widerstandselement mit feineren nicht-leitenden Partikeln

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Publication number Priority date Publication date Assignee Title
JPH11233232A (ja) * 1997-04-23 1999-08-27 Ngk Spark Plug Co Ltd 抵抗体入りスパークプラグ、スパークプラグ用抵抗体組成物及び抵抗体入りスパークプラグの製造方法
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EP4156424A4 (fr) 2024-06-05
CN115699484A (zh) 2023-02-03
CN115699484B (zh) 2024-04-16
JP7319463B2 (ja) 2023-08-01
JPWO2022059658A1 (fr) 2022-03-24
EP4156424A1 (fr) 2023-03-29
US20230178968A1 (en) 2023-06-08

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